TiO_2/SiO_2复合材料的制备及其光催化性能的研究

以钛酸丁酯和正硅酸乙酯为主要原料,用两步溶胶-凝胶法制备了TiO2/SiO2复合材料,并对其光催化降解活性艳红X-3B溶液的性能进行了研究,考察了Ti∶Si摩尔比、焙烧温度、初始浓度和催化剂用量对其光催化降解率的影响。结果表明,当n(Ti)∶n(Si)=6∶1,焙烧温度为500℃时TiO2/SiO2复合材料的光催化活性最好,比相同条件下纯TiO2的光催化活性有明显提高;相同条件下,降解率随溶液初始浓度的升高而降低,催化剂用量存在最佳值,25 mg/L的活性艳红X-3B溶液,催化剂用量的最佳值为1.6 g/L。

Study on Preparation and Photocatalytic Properties of TiO_2/SiO_2 Composite Powders

TiO2/SiO2 composite powders were prepared using two-step sol-gel method,with tetrabutyl titanate and tetraethyl orthosilicate as the main raw materials,and its photo catalytic properties for degradation of active brilliant red X-3B solution were researched through Ti∶Si molar ratio,calcined temperature,initial concentration and photocatalyst dosage.The results indicated that the TiO2/SiO2 composite powders of n（Ti）∶n（Si）∶6∶1,calcined at 500 ℃ had the best photo catalytic activity,and the photocatalytic activity of the composite were higher than that of pure TiO2 under the same conditions;moreover,it was found that degradation rate of active brilliant red X-3B solution decreased with its initial concentration increasing,and the optimum dosage of composite photocatalysts was 1.6 g/L when the initial concentration of active brilliant red X-3B solution was 25 mg/L.